Twin coil

Abstract

A coil arrangement comprising two coils on a single coil former, termed a twin coil, is characterized in that the two coils (W1, W2 and, respectively, W3A), with any respective individual magnetic core (10 or, respectively, 9) required, are mounted with a substantial distance from each other on the coil former (1) and in that the respective residual coupling of the coils (W1, W2 and W3A) is eliminated by an oppositely wound or connected compensation winding (W3B). The compensating winding (8) is located in the one winding compartment (3) and has current from the coil in the other winding chamber (4) flowing through it. As a result the twin coil in accordance with the invention leads to some advantages over known twin coils in which the coupling between the two coils is nearly 100%.

We claim: 
     
       1. A twin coil arrangement comprising: an elongate coil former having substantially spaced magnetic coil cores thereon with the spacing between said cores permitting relatively minimal magnetic coupling between any coils wound on said cores; a first coil formed by a first winding on one of said cores; a second coil formed by a second winding on the other of said cores; and a compensating winding surrounding said second winding, said compensating winding being oppositely wound, and electrically coupled to said first winding forming and said first coil, said compensating winding eliminating any residual coupling between said first and second coils. 
     
     
       2. A twin coil arrangement as in claim 1, in which said second winding of said second coil is formed as a primary winding surrounding a secondary winding on said other core. 
     
     
       3. A twin coil as in claim 1, in which flanges are formed on said spaced cores to define winding compartments for the windings forming the coils on said cores.